Elevator derailment detection device

1. An elevator derailment detection device, which is configured to detect derailment in which an elevating body guided by a guide rail to raise and lower disengages from the guide rail, the elevator derailment detection device comprising: a first conductive wire and a second conductive wire, which are provided in a hoistway in parallel with an elevating direction of the elevating body; a derailment detector configured to detect the derailment; a power supply including a first DC power supply configured to output a first DC voltage to apply a voltage to the first conductive wire and a second DC power supply configured to output a second DC voltage, which is lower than the first DC voltage, to apply a voltage to the second conductive wire; a contact, at the elevating body, and is configured to be brought into contact with the first conductive wire and the second conductive wire when the derailment occurs, to thereby bring the first conductive wire and the second conductive wire into conduction with each other; a switch configured to switch a state of connection between the power supply and a diagnosis target, which includes the derailment detector, between a conductive state and a non-conductive state; and a controller configured to perform diagnosis processing for diagnosing the diagnosis target, wherein the derailment detector is configured to detect the derailment by detecting that the voltage applied to the second conductive wire has increased to a level higher than the voltage applied to the second conductive wire when the derailment has not occurred, and wherein the controller is configured to control the switch in the diagnosis processing to inspect a behavior of the diagnosis target, to thereby diagnose soundness of the diagnosis target.

2. The elevator derailment detection device according to claim 1, wherein the derailment detector includes a relay configured to operate when the voltage applied to the second conductive wire has increased to a level higher than the voltage applied to the second conductive wire when the derailment has not occurred.

3. The elevator derailment detection device according to claim 1, further comprising: a first circuit abnormality detector configured to detect a first circuit abnormality, in which the first DC power supply and the first conductive wire are brought into the non-conductive state with each other; and a second circuit abnormality detector configured to detect a second circuit abnormality, in which the second DC power supply and the second conductive wire are brought into the non-conductive state with each other, wherein the first circuit abnormality detector is configured to detect the first circuit abnormality by detecting that no voltage is being applied to the first conductive wire, wherein the second circuit abnormality detector is configured to detect the second circuit abnormality by detecting that no voltage is being applied to the second conductive wire, and wherein the controller is configured to diagnose the diagnosis target further including the first circuit abnormality detector and the second circuit abnormality detector.

4. The elevator derailment detection device according to claim 3, wherein the first circuit abnormality detector includes a relay configured to operate when a voltage is being applied to the first conductive wire, and wherein the second circuit abnormality detector includes a relay configured to operate when a voltage is being applied to the second conductive wire.

5. The elevator derailment detection device according to claim 1, wherein the switch includes a relay configured to operate when an electric signal is input from the controller, to thereby switch the state of connection between the power supply and the diagnosis target from the conductive state to the non-conductive state.

6. The elevator derailment detection device according to claim 1, wherein the controller is configured to inspect the behavior of the diagnosis target by switching the state of connection between the power supply and the diagnosis target from the conductive state to the non-conductive state in the diagnosis processing.

7. The elevator derailment detection device according to claim 1, wherein the diagnosis target is configured to operate when an electric signal is input from the controller, and wherein the controller is configured to inspect the behavior of the diagnosis target by switching the state of connection between the power supply and the diagnosis target from the conductive state to the non-conductive state in the diagnosis processing, outputting the electric signal to the diagnosis target, and then stopping outputting the electric signal.

8. The elevator derailment detection device according to claim 6, wherein the controller is configured to inspect the behavior of the diagnosis target by further switching the state of connection between the power supply and the diagnosis target from the non-conductive state to the conductive state in the diagnosis processing.

9. The elevator derailment detection device according to claim 1, further comprising a reset switch, which is switchable between an on state and an off state, and is configured to output an on signal to the controller when the reset switch is turned on, wherein the controller is configured to determine that the derailment has occurred when the derailment is detected by the derailment detector, and to redetermine that the derailment has not occurred when the on signal is input from the reset switch in a case where the controller has determined that the derailment has occurred, and wherein the controller is configured to further diagnose the soundness of the reset switch in the diagnosis processing based on whether the on signal is input from the reset switch.

10. An elevator derailment detection device, which is configured to detect derailment in which an elevating body guided by a guide rail to raise and lower disengages from the guide rail, the elevator derailment detection device comprising: a first conductive wire and a second conductive wire, which are provided in a hoistway in parallel with an elevating direction of the elevating body; a derailment detector configured to detect the derailment; a power supply including a first DC power supply configured to output a first DC voltage to apply a voltage to the first conductive wire and the second conductive wire; a contact, at the elevating body, and is configured to be brought into contact with the first conductive wire and the second conductive wire when the derailment occurs, to thereby bring the first conductive wire and the second conductive wire into conduction with each other and achieve a state in which an overcurrent flows into the first DC power supply; a switch configured to switch a state of connection between the power supply and a diagnosis target, which includes the derailment detector, between a conductive state and a non-conductive state; and a controller configured to perform diagnosis processing for diagnosing the diagnosis target, wherein the derailment detector is configured to detect the derailment by detecting the overcurrent, and wherein the controller is configured to control the switch in the diagnosis processing to inspect a behavior of the diagnosis target, to thereby diagnose soundness of the diagnosis target.

11. The elevator derailment detection device according to claim 10, further comprising: a first circuit abnormality detector configured to detect a first circuit abnormality, in which the first DC power supply and the first conductive wire are brought into the non-conductive state with each other; and a second circuit abnormality detector configured to detect a second circuit abnormality, in which the first DC power supply and the second conductive wire are brought into the non-conductive state with each other, wherein the first circuit abnormality detector is configured to detect the first circuit abnormality by detecting that no voltage is being applied to the first conductive wire, wherein the second circuit abnormality detector is configured to detect the second circuit abnormality by detecting that no voltage is being applied to the second conductive wire, and wherein the controller is configured to diagnose the diagnosis target further including the first circuit abnormality detector and the second circuit abnormality detector.

12. The elevator derailment detection device according to claim 11, further comprising an overcurrent detector configured to detect the overcurrent, wherein the derailment detector includes the first circuit abnormality detector and the second circuit abnormality detector, and wherein the first circuit abnormality detector and the second circuit abnormality detector are configured to detect the derailment by detecting that the overcurrent detector has operated.

13. The elevator derailment detection device according to claim 11, wherein the first circuit abnormality detector includes a relay configured to operate when a voltage is being applied to the first conductive wire, and wherein the second circuit abnormality detector includes a relay configured to operate when a voltage is being applied to the second conductive wire.

14. The elevator derailment detection device according to claim 10, wherein the switch includes a relay configured to operate when an electric signal is input from the controller, to thereby switch the state of connection between the power supply and the diagnosis target from the conductive state to the non-conductive state.

15. The elevator derailment detection device according to claim 10, wherein the controller is configured to inspect the behavior of the diagnosis target by switching the state of connection between the power supply and the diagnosis target from the conductive state to the non-conductive state in the diagnosis processing.

16. The elevator derailment detection device according to claim 10, wherein the diagnosis target is configured to operate when an electric signal is input from the controller, and wherein the controller is configured to inspect the behavior of the diagnosis target by switching the state of connection between the power supply and the diagnosis target from the conductive state to the non-conductive state in the diagnosis processing, outputting the electric signal to the diagnosis target, and then stopping outputting the electric signal.

17. The elevator derailment detection device according to claim 10, further comprising a reset switch, which is switchable between an on state and an off state, and is configured to output an on signal to the controller when the reset switch is turned on, wherein the controller is configured to determine that the derailment has occurred when the derailment is detected by the derailment detector, and to redetermine that the derailment has not occurred when the on signal is input from the reset switch in a case where the controller has determined that the derailment has occurred, and wherein the controller is configured to further diagnose the soundness of the reset switch in the diagnosis processing based on whether the on signal is input from the reset switch.